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Bajala, a small town in the Udupi district of Karnataka, India, occupies a coastal plain location at approximately 12.8537°N, 74.8853°E. Situated roughly 6km inland from the Arabian Sea, its terrain is largely flat, characteristic of the coastal Karnataka region. The surrounding landscape is a mosaic of coconut plantations, paddy fields, and dense vegetation, typical of the Malabar Coast. Bajala’s position within this agricultural belt significantly influences local air quality, with seasonal burning of agricultural residue contributing to particulate matter. The town’s relatively small population of 13,141 suggests a predominantly rural character, though increasing connectivity to larger urban centres like Udupi and Mangalore is driving urbanisation. This urban-rural gradient is crucial; increased vehicular traffic from these connections, alongside localised construction, introduces pollutants. The proximity to the Arabian Sea provides some degree of atmospheric dispersion, but during calmer periods, pollutants can accumulate. The lack of significant industrial activity *within* Bajala itself is a mitigating factor, however, regional industrial emissions from areas further north along the coast can be transported by prevailing winds. Understanding these geographical factors is vital for assessing and managing air quality in Bajala.

Bajala experiences a tropical monsoon climate, dictating a distinct wet and dry season pattern that profoundly impacts air quality. The southwest monsoon, typically arriving in June and lasting until September, brings heavy rainfall which effectively washes particulate matter from the atmosphere, resulting in generally cleaner air during these months. However, increased humidity can also foster mould growth, impacting respiratory health. October to February constitutes the dry season, marked by lower rainfall and calmer winds. This period sees a build-up of pollutants, particularly from agricultural burning post-harvest and increased dust from unpaved roads. January and February are often the months with the poorest air quality. March to May brings rising temperatures and pre-monsoon showers. These showers offer temporary relief, but the heat exacerbates ground-level ozone formation. Temperature inversions, common during the cooler months, trap pollutants near the surface. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season, particularly in January and February. Wearing masks and monitoring health are crucial preventative measures. The monsoon months offer the most favourable conditions for outdoor activity.